Fabrication of non-enzymatic sensor using Co doped ZnO nanoparticles as a marker of H2O2

Co doped ZnO nanoparticles were prepared by a simple thermal method and their functional relationships with H2O2 sensing were investigated. The sensing potential of Co doped ZnO nanoparticles were investigated using cyclic voltammeter. Co doped ZnO nanoparticles were characterized by FESEM, EDS, XRD, FTIR and XPS. The data obtained from the sensing study showed that Co doped ZnO nanoparticles are more sensitive toward H2O2. The results suggested that Co doped ZnO nanoparticles displayed tremendous electro-catalytic property for the reduction of H2O2. The performance of the sensor was further optimized using various pH and different scan rates. The developed sensor displayed high sensitivity (92.4444 mu A mM(-1) cm(-2)) and lower limit of detection (143 mu M). Thus Co doped ZnO nanoparticles could be potential material for the construction of sensitive and efficient hydrogen peroxide sensor. (C) 2014 Elsevier B.V. All rights reserved.